caricatures

In Ferdinad the bull there is caricatures of the artists. But I wonder if there isnt´t a few other caricatures of actors that was famous at that time. For example is he man who comes in at th arena with the knife very look-alike Peter Lorre and he does the same gesture as Peter Lorre did in Secret agent, Groucho Marx seems also to be one of he men at the arena. The woman who walks up the stairs walks exactly in the same way as Marlene Dietrich in The woman is a devil. Is this just coincidences?